xgboost 0.90 (new formula)

Closes #43246.

Signed-off-by: FX Coudert <fxcoudert@gmail.com>

Formula/xgboost.rb

@@ -0,0 +1,26 @@
+class Xgboost < Formula
+  desc "Scalable, Portable and Distributed Gradient Boosting Library"
+  homepage "https://xgboost.ai/"
+  url "https://github.com/dmlc/xgboost.git",
+      :tag      => "v0.90",
+      :revision => "515f5f5c4779ff5361dcd796e22d55937e1048ea"
+
+  depends_on "cmake" => :build
+
+  def install
+    mkdir "build" do
+      system "cmake", *std_cmake_args, "-DUSE_OPENMP=0", ".."
+      system "make"
+      system "make", "install"
+    end
+    pkgshare.install "demo"
+  end
+
+  test do
+    cp_r (pkgshare/"demo"), testpath
+    cd "demo/data" do
+      cp "../binary_classification/mushroom.conf", "."
+      system "#{bin}/xgboost", "mushroom.conf"
+    end
+  end
+end